Release: spawn-fcgi 1.6.4

spawn-fcgi now interprets the mode (-M) always as octal integer (same as chmod). Also it will always set the mode (for Unix domain sockets, not TCP); the default will remove the executable bits and read+write access for others (in addition to umask restrictions).

If you want others to be able to connect to your Unix domain socket, you have to manually specify -M 0666 (or better: create a shared group, or spawn as root and use the -u and -U options)